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IS 3670 (1989) : Code of practice for construction of timber
floors [CED 13: Building Construction Practices including
Painting, Varnishing and Allied Finishing]
Satyanarayan Gangaram Pitroda
Invent a New India Using Knowledge
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PROTECTED BY COPYRIGHT
Indian Standard
IS 3670 : 1989
( Reaffirmed 2000 )
CONSTRUCTION OF TIMBER FLOORS —
CODE OF PRACTICE
( First Revision )
( q^ciT q^taruT )
UDC 692-535- 1 : 00676
© BIS 1990
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
February 1990 Price Group 7
Building Construction Practices Sectional Committee, BDC 13
FOREWORD
This Indian Standard ( First Revision) was adopted by the Bureau of Indian Standards on 23 June 1989,
after the draft finalized by the Building Construction Practices Sectional Committee had been approved
by the Civil Engineering Division Council.
Timber floors are being provided in auditoriums, gymnasiums, dancing halls, squash courts, public
balconies and galleries, skating-rinks, etc, for noise retardent floor finish and in hilly areas as thermal
insulating floor finish. These floors may also be used in timber framed construction to serve as structural
floors. This standard is intended to serve as a guide for the selection of timber, specifications for floor
boards and also as the construction criteria of floors by using suitable species of timber available in
different parts of this country.
This standard was first published in 1966. The present revision updates the standard, in respect of some
important additions which include construction details of basement floors, fixing details of timber flooring
and floor. The revision also covers modifications in detailing of purpose made floors and sub-floors of
cement concrete and wooden fillets. A few new varieties have also been added to recommended the list
of species for timber floors.
IS 3670 : 1989
Indian Standard
CONSTRUCTION OF TIMBER FLOORS
CODE OF PRACTICE
( First Revision )
1 SCOPE
1.1 This standard covers the selection of suitable
timber species and their treatment for the purpose of
fabrication and laying of different types of timber
floors and their relevant components.
2 REFERENCES
2.1 The Indian Standards listed in Annex A are
necessary adjuncts to this standard.
3 TERMINOLOGY
3.1 For the purpose of this standard, the definitions
given in IS 707 : 1976 along with the following shall
apply.
3.2 Binders
The timber joists introduced to support the load
carried by bridging joists when the span of latter
becomes too large.
3.3 Bridging Joists
The timber joists that immediately support a floor
boarding.
3.4 Floor Seals
In timber floor finishing, any substance used to fill
the pores in standard surface so as to decrease the
porosity of surface for finish coatings.
3.5 Girders
Timer joists of heavy sections introduced to support
the load of bridging joist and the floor transmitted
through binders.
3.6 Panels
Square portions of the parquetted floor having large
areas and laid in symmetrical designs.
3.7 Parquetted Floors
A construction in which a floor consists mainly of
a sub-floor of timber boards and main floor of
timber parquets which are laid in variety of panel
designs as well as in square edged hardwood battens.
3.8 Sleeper or Dwarf Walls
A wall constructed between two main walls at a
considerable distance apart to provide intermediate
support to the bridging joist. A longitudinal piece
of timber is fixed on the top of sleeper wall and
timber bridging joists are nailed to this piece. Dwarf
walls are constructed on floor one ( ground floor )
only.
3.9 Solid Floors
A construction in which a floor is laid over a filling
of well compacted sand, murum, earth, etc. It is
thus supported over its whole area by the underlying
material.
3.10 Strutting
Transverse or diagonal timber pieces between two
adjacent bridging joists to stiffen the latter.
3.11 Suspended Floor or Hollow Floor
A construction in which the floor is supported only
at its edges, ends or at a few well defined areas over
walls, beams, wooden fillets, etc, to span across a
void.
3.12 Trimmed Joists
The timber joists that are trimmed and framed into
a trimmer where an opening has to be formed.
3.13 Trimmer Joists
A cross timber into which the ends of trimmed
timbers are framed.
3.14 Trimming Joists
The full length timber joists on either side of trimmed
joists.
3.15 Wall Plates
A timber plate laid along a continuous wall of
concrete or masonry.
3.16 Wooden Fillets
A strip of timber secured to concrete base and to
which flooring is fixed.
4 NECESSARY INFORMATION
4.1 Exchange of Information
Consultation and exchange of information shall be
arranged at an early date between all parties con-
cerned with the building operations so that each may
have full knowledge of the particulars of work and
be able to co-operate in producing the conditions
required by other to complete a satisfactory job.
1
IS 3670 : 1989
4.1.1 For efficient planning, design and execution of
( amended ) the flooring work, the following points
should be taken into account:
a) The area of floor to be covered;
b) Type of timber flooring to be laid;
c) Species and grade of timber to be used;
d) Thickness of flooring;
e) Relationship of the level of finished floor to a
datum;
f ) Type of damp proofing, if any;
g) Type and thickness of screeded bed, if any;
h) Preservative treatment;
j ) Any work consequent upon services passing
through the flooring;
k) Type of underlay, if any;
m) Method of fixing;
n) Treatment of skirtings;
p) Treatment of junction with adjacent flooring;
q) Any dressing or polish required; and
r) Conditions of contract which may affect this
particular work.
4.2 Time Schedule
When a time schedule is prepared, arrangements
shall be made amongst other things for:
a) all services to be laid befor the base is formed;
b) any concrete in the base to have time to
harden and dry before flooring is laid, in case
of unventilated floor; and
c) where required, flooring to be protected on
completion from damage by other trades.
4.2.1 The schedule may be made as per critical path
Method ( CPM ) or programme evaluation and
review techniques ( PERT ) to include the different
activities of work, such as:
a) selection and sizing of the timber as per
design criteria,
b) procurement of construction materials and
labourers,
c) seasoning and treatment of timber,
d) commencement of work under the supervision
of a highly skilled carpenter, and
e) completion of work along with necessary
finishing.
5 MATERIALS
5.1 Species of Timber
5.1.1 Species of timber recommended for floor
boards shall be those as given in Annex B with their
percentage of indentation for hardness, taking teak
as 100. Species of timber selected for girders, binders
and projecting joists shall be as given in Annex C.
5.1.2 Timber selected for construction of floor
boards and supporting members shall conform to the
requirements specified in Annex D.
5.1.3 Different species of timber possessing different
hardness shall not be used together to avoid uneven
wear of the floor.
5.2 Nails
The nails shall conform to IS 723 : 1972. The
dimensions and approximate count of round chequer-
ed head nails shall be those as given in Table 1 of
IS 723 : 1972. The nails shall be diamond pointed.
6 DESIGNING, TREATMENT AND
PROTECTION OF TIMBER
6.1 All timber members may be designed in accor-
dance with IS 883 : 1970.
6.2 Seasoning
All timber used for timber floors shall be thoroughly
seasoned in accordance with IS 1141 : 1973.
6.3 Preservation
After seasoning, the timber shall be treated with
preservatives in accordance with IS 401 : 1982.
6.3.1 The timber shall be seasoned for the second
time in case, the water soluble preservatives are
applied.
6.3.2 Cutting, preboring, etc, should be avoided as
far as possible after the application of preservatives.
6.3.3 Even for buildings with proper anti-termite
measures incorporated, it is advisable to chemically
treat the timber used for floors.
6.4 Protection Against Termites
The protection against termites shall be provided
to timber floored houses particulary on the ground
floor in accordance with IS 6313 (Part 1 ) : 1981.
6.5 Protection Against Dampness
The entry of ground moisture may be prevented by
the inclusion of damp-proof layer at a suitable
position in the building in accordance with
IS 1609 : 1976. This layer should be impervious to
moisture both in liquid and vapour forms and
shall extend without break over the whole area of
flooring.
7 TYPES OF TIMBER FLOORS
7.1 Generally, timber floors are of the following
types:
a) Single joisted floors having bridging joist only,
b) Double joisted floors having bridging joists
supported on binders,
c) Triple joisted or framed floors having bridging
joists supported on binders and framed into
girders,
d) Solid timber floors/wood block floor, and
e) Purpose made floors/parquet floors, etc.
IS 3670 : 1989
8 CONSTRUCTION
8.1 Single Joisted Timber Floor for Basement/Ground
Floors
This type of timber floor is constructed on ground
floor, generally in theatres where dance and drama
performances are regularly held. Also they are
suited for buildings situated in hilly and damp
areas. Timber floors are supporled by bridging joists
spaced 300 to 450 mm on centres with max span of
3 m. Minimum width of timber joists shall be not
less than 50 mm and the depth may be 3 to 4 times
the thickness so that they may not deflect by more
than 1/360 of the span due to floor loadings.
Construction steps are as under:
a) The area over which the timber floor is to be
constructed is first cleaned properly.
b) The cleaned ground is evenly spread and
compacted and over it, a 100 mm bed of M10
cement concrete ( 1 cement : 3 sand : 6
coarse aggregate of 19 mm gauge) is laid and
spade finished. This bed, also known as
surface or site concrete, is provided to check
dampness, vegetable growth and admission of
ground air.
c) Honey-combed sleeper walls or dwarf walls,
preferably of half brick thickness are construc-
ted at an interval of 2 m with suitable height
(see IS 1905 : 1980).
d)
In case of basement floors, particularly for the
theatres, the space between the dwarf walls
may be filled up with dry sand up to the DPC
level as shown in Fig. 1. DPC is placed in the
external walls and at the top of the dwarf
walls.
-FLOOR BOARD
r-JOIST
- ,'/\\ ■ ^,Sd^ -rVy ■ I' ., H ' -"jj-ff ^- k _j*' ^,>\ v fe'.
WALL PLATES
m
DWARF
WALL —
■•-<
SAND
FILL
m
\
CT-:-^---.K
WAVAS'/'»
^y/,sy//.\
W\V//S
100 mm THICK CEMENT
CONCRETE
Fig. 1 Basement Timber Floor
e) Over the DPC on dwarf walls longitudinal
wooden members, called sleeper wall plates
(generally 100 mm X 100 mm) are solidly
bedded level by means of suitable lime or
cement mortar.
f) The timber floor joists, called bridging joists,
of size as mentioned above are then nailed to
these sleeper wall plates as shown in Fig. 2.
Fig. 2 Single Joisted Floor
g) Arrangement for air circulation under the
timber floor should be there to prevent dry
rot of timber. Where sand filling is not
applied, the whole space on both sides of
dwarf walls are kept vacant with facilities for
cross-ventilation below the floor by providing
honey-comb brick masonry as shown in
Fig. 3.
WALL PLATE-
7
•damp-proof course
bridging joist-
Fig. 3 Honey Combed Sleeper Wall
h) The ventilated space per linear of outer
foundation wall shall be provided as given
below:
Climate
Sp
ace Required
mm 2
Very humid
8 500
Humid
6 500
Mild
4 500
Dry climate
2 200
j) Ventilators provided on the outer walls shall
be covered with wire gauge ( Fig. 4A and
Fig. 4B ) or other such effectual methods to
prevent possible entry of sparrows, rats,
reptiles, etc.
k) There should be a gap between the underside
of every joist/girder of the ground floor and
the top surface of the sand filling or site
concrete.
IS 3670 : 1989
BRIDGING JOIST
FLOOR BOARD-
MASONRY
WALL
VENTILATOR
WALL PLATE
TERMITE
SHIELD
VENTILATOR
Cover with wire gauge
4A Cross Ventilation Under Timber Floor
! t
AIR FLOW AIR FLOW
V denotes ventilator
4B Foundation Lay Out of a Building Showing Dead Spots and Air Space in
Intermediate Walls for Cross Ventilation
Fig. 4 Ventilation Under Timber Floor at Ground Level
4
IS 3670 : 1989
m) The ends of joists are fixed with sleeper wall
plates by driving nails through their sides
into them.
n) Walls-plates and ends of the joists should not
be built into the side walls. A separate slipper
wall may be constructed to avoid possible
early decay of the timber.
p) Spacing of bridging joists may usually be 300
to 450 mm on centres spanning in the shorter
direction. Sizes will vary according to loads.
q) On the properly fixed and levelled joists
25-30 mm thick wooden boards 100-150 mm
wide and 3 m long, generally widened by
ploughed and tongued joints are carefully
laid and fixed by nailing/screwing (Fig. 5A
and Fig. 5B ).
them. The approximate depth of bridging joists may
be equal to ( 4 x span in meter +5 ) cm. On the under-
side of this types of floors, ceiling joists may be fixed
to accommodate ceilings, wherever desired.
Construction procedure
floors is as follows:
for this type of wooden
-6mm THICK & 25mm WIDE
PLYWOOD IN BETWEEN
TIMBER FLOOR
30mm THICK
TIMBER PLANK
5B
Fig. 5 Typical Detail of Fixing
of Timber Flooring
r) The surface on the boards are then carefully
levelled and rubbed smooth with glass paper
and finally oiled or waxed and polished.
8.1.1 Timber Floors for Upper Floors
These may be of (a) single joisted, (b) double joisted
(c) triple joisted floors depending on the span of
joists and the loads to be supported upon. This type
of floors should also be strong and rigid enough to
take loads and check vibrations due to walking on
a) Wooden joists called bridging joists shall be
placed at about 300 to 400 mm centre, span-
ning the room in the shorter direction which
should not exceed 4 m ( see Fig. 6 ).
b) The joists are supported on wall plates of
100 mm x 70 mm and 120 mm x 70 mm size
duly placed on specially built off sets by brick
works. They should be bedded in the way as
stated earlier. No wall plate shall be built into
solid walls as it causes decay. When joists are
directly built into walls without wall plates,
their ends bedding into the wall shall be
treated with suitable preservatives in
accordance with IS 401 : 1982 and gaps at
the end and top should be kept as shown in
Fig. 2 and Fig. 7.
c) In case the span of the bridging joists is more
than 2'5 m, they should be stiffened by pro-
viding cross-bracings or strutting in between
them in continuous rows at intervals of not
more than 2 m apart to prevent buckling or
vibrations due to walking.
d) Strutting shall normally be of herring bone
type, formed by timber pieces of size
50 mm x 30 mm crossing each other between
the bridging joists. The ends of struts are
splayed and secured to the sides of the joists
by means of mild steel nails. The ends of the
struts are generally kept about 6 to 1 2 mm
away from the top and bottom of the joists as
shown in Fig. 8.
Solid strutting, usually provided for heavy
floors should have the depth of strutting
member as three-fourth of the depth of joists
and breadth should be one-third to one-fourth
the depth as shown in Fig. 9.
e) Ceiling joists are to be fitted, if necessary,
below the bridging joist or ceiling may be
fixed with the solid strutting exposing the
bridging joists.
f) Trimming or framing of timbers around
openings in timber floors due to provision of
fire place, wooden stairs, etc, shall consist of
trimming joists, trimmer joists and trimmed
joists as shown in Fig. 6.
8.2 DoubJe Joisted Timber Floors
These are stronger than the single joisted floors and
are used where the span of the bridging joists is
between 3 '5 and 5 m.
IS 3670 : 1989
BRIDGING JOIST
V V\^^^XX^\,:
TRIMMER
JOIST-
TRIMMED
JOIST-
^ FIRE
*
PLACE
m
X
h
^^^-NX-V\1
-SOLID
TIMBER
STRUTTING
/-TIMBER FLOORING
BOARD
-trimming joist
Fig. 6 Single Joisted Upper Floor
STONE
TEMPLATE-
TRIMMING
JOIST -n.
TRIMMED
JOIST^.
TRIMMER
JOIST-
BINDER
7
ram
JH2
^
E
'A
BRIDGING
1 JOISTS
f^/// ; //z .
=K=a
h-X
-FLOOR BOARD
BRIDGING JOISTS
•MASONRY WALL
ENLARGED SECTION XX
Fig. 7 Double Joisted Floor
6
IS 3670 : 1989
-25 TO 40 mm THICK
FLOOR BOARD
-50x30 mm MIN HERRING
BONE STRUTTING
SECTION XX
Fig. 8 Herring Bone Type Timber Strutting
v 25 TO 40mm THICK „. ._
\ FL00R B0ARD AtrStting
v^
vs
/
\
,.
H
5T
/
- 3/4 OF THE DEPT
OF BRIDGING JOIS
SECTION XX
Fig. 9 Solid Type Strutting Between Bridging Joists
IS 3670 : 1989
8.2.1 To make a more sound proof rigid type of
flooring, the construction procedure is as follows:
a) The bridging joists instead of spanning from
wall to wall are supported by larger horizontal
members called binders at suitable intervals.
b) Floor boards, as usual, are to be supported
by bridging joists.
c) Binders are to be spaced 2 m on centres
spanning in the shorter direction of the room
preferably not exceeding 5 m. The binders
shall not be placed over door or window
openings unless well designed lintels or beams
are placed there to support the binders with
respective loads. The ends of binders if
embedded into walls are to be kept on
wooden or stone blocks with necessary gaps
at top and end to avoid contact with masonry
as shown in Fig. 7.
d) Ceilings may be fixed to the bottom of the
binders by fixing ceiling joists to binders.
8.3 Triple Joisted/Framed Floors
This type of timber floor is used where the span of
binders generally 5 to
load is relatively heavy.
10 m and the superimposed
8.3.1 Framed floor ( see Fig. 10) consists of three
sets of joists and the construction procedure is as
follows:
a) Bridging joists carrying the floor boards as
usual are supported on binders or binding
joists which in turn will rest on timber
girders.
b) Timber binders or binding joists are con-
nected to girders by tusk and tenon joints.
The line of binders in each section ( that is,
in between the girders ) shall be staggered to
avoid tenons coming directly opposite to each
other and this weakening the girders.
c) Timber girders are to be supported on walls in
shorter direction preferably not exceeding
5 m. The ends of girders duly creosoted or
tarred are put on stone or concrete templates
in the wall.
d) Ceilings can be fixed directly to the binders
or by employing ceiling joists.
-GIRDER
_ SPACING OF m
GIRDER ^5m
-MASONRY WALL
-FLOOR BOARD
BRIDGING JOIST
LEOGER FIXED TO
GIRDER WITH NAILS
OR SCREWS
BINDER
GIRDER
ENLARGED SECTION XX
Fig. 10 'Framed or Triple Joisted Floor
8
IS 3670 : 1989
8.4 Solid Timber Floors
As described earlier, this type of floors are for base-
ment/ground floors. Solid flooring consists of a
sub-floor of cement concrete (1:3:6) and the
main floor of timber planks. Floor laying pro-
cedure is as follows:
a) Sub-floor of cement concrete about 100 mm
in thickness is casted in the usual way.
b) Wooden Fillets
When the cement concrete sub-floor is still
wet and has not hardened, well treated timber
fillets of size 100 mm x 40 mm made from
heartwood of hardwood species shall be
flushed with the top of the sub-floor. For
floors where springing effect is desired, for
example, in dance floors, the timber fillets
shall be raised by about 8 mm above the
level of the sub-floor.
The fillets shall be laid along the short span,
spaced 600 mm on centres and shall be
embedded minimum up to one-third of the
depth of sub-floor as shown in Fig. 11 to
protect planks from dampness.
c) Coating of Bitumen
One coat of bitumen shall be applied on the
exposed top of the sub-floor above which 8
mm gap is provided.
d) Main Floor
It shall be of timber planks at least 25 mm in
thickness and shall be supported on timber
fillets as shown in Fig. 1 1 .
8.5 Purpose-made Floors
8.5.1 These are not generally made solid. Floors
are primarily hollow floors with bridging joists,
binders, etc. These are named according to the pur-
pose they serve, such as:
a) Skating rink floor,
b) Badminton floor, and
c) Squash floor, etc.
LONGER SPAN OF THE ROOM
J- 600 mm — "-f- — 600 mm
I
25 mm MIN
CEMENT CONCRETE
50 TO 75 mm THICK
WITH ONE COAT OF
BITUMEN
8 mm
ONE COAT OF BITUMEN AIRGAP
125x40 mm WOODEN
FILLET
(MAIN FLOOR OF TIMBER WITHOUT PLANKS)
1
SECTION XX
(MAIN FLOOR OF TIMBER WITH PLANKS)
Fig. 11 Room Showing Sub- Floor of Cement Concrete and Wooden Fillets
9
IS 3670 : 1989
8.5.2 Laying details are:
a) Timber fillets or plugs about 100 mm deep,
bolts about 200 mm long and of 12 mm dia
shall be embedded at suitable points in the
cement concrete floor during its casting.
b) The timber fillets or plugs or bolts shall be
at a maximum distance of one m centre to
centre along the longer length of the wall of
the room.
c)
Timber floor joists properly creosoted/tarred
are laid over the concrete by fixing them with
the fillets/extended mild steel bolts as the case
may be ( see Fig. 12A, 12B and 12C ).
-30 mm THICK
\TIMBER FLOORING
SCREW FOR FIXING
THE FLOOR PLANKS;*
SECTION
-BOLT FOR FIXING THE
FLOOR JOIST WITH
CONCRETE FLOOR-
FLOOR JOIST
SIDE ELEVATION
-SCREW FOR FIXING
THE TIMBER FLOOR
TOP PLAN
Fig. 12 Typical Detail of Fixing of
Floor Joist and Timber Floor
d) An iron screw shall pass through the joists
and the wooden fillet. In case of mild steel
bolts, they are inserted into the prebores on
the joists from bottom. On the top face, a
groove 20 mm x 20 mm is cut up to 25 mm
deep where the bolt is tightened by nuts and
then the groove is covered by small wooden
blocks having their grains in similar directions
as on the joists.
e) For fixing the floor boards with the joists,
timber runners of type shown in Fig. 13B
may be inserted into the grooves suitably cut
on the vertical side of the joist as shown in
Fig. 13A & 13B. These runners are then
screwed with the boards from the bottom so
that the screws remain invisible from the top
of the board. There may be another joint
called 'B1LLI joint' which is made by a piece
of timber of harder species, one end of which
is loosely screwed with the timber board from
the bottom and the other end is inserted into
the groove cut along the side of the joist as
shown in Fig. 13B and 13C. The floor
boards can be properly fixed with each other
and also with the joists as shown in Fig. 5
and Fig. 12. Jointing of floor boards by
fillets, joists by screws, etc, for squash court
which are more convenient from the point of
construction and maintenance are also shown
in the above figures.
9 TIMBER FLOOR BOARDS
9.1 The floor boards, 25 to 30 mm thick, 100 to 150
mm wide and 2 to 3 m long are jointed with each
other by widening joints as detailed below and fixed
with the joints by nailing/screwing which are kept
concealed from the top by putty or small wooden
blocks inserted into the groove over and around the
nails/screws as stated above.
10 JOINTING DETAILS FOR FLOOR BOARDS
10.1 The following types of widening joints (see
Fig. 14) listed in the order of their efficiency shall
generally be used for the jointing of floor boards:
a) Ploughed and tongued joints;
b) Splayed, rebated, tongued and grooved joints;
c) Rebated, tongued and grooved joints;
d) Tongued and grooved joints;
e) Rebated joints;
f ) Rebated and filleted joints;
g) Splayed joints; and
h) Square or butt joints.
10.2 For all the joints detailed above, the screw
shall be driven from the top of the floor boards
down to the timber joist below. Generally, these
are concealed by putty, etc, and then the floor
surface is level finished.
11 FLOOR SEALS
11.1 The pores of timber floor shall be sealed with
an efficient type of floor seal. The type of floor seal
shall depend upon the purpose of the floor.
11.2 Choice of Floor Seal
Depending upon the appearance and wearing
characteristics needed, a floor seal of traditional oils,
paste, wax, button polish, etc, or synthetic resin
floor polishes may be used. Where appearance is a
special consideration, special type of floor seals
which are foreign products and as given in Annex E
shall be used.
10
SKIRTING
150
FLOOR JOIST
50
TIMBER
RUNNER-7 / r
-1m MAX-
-TIMBER FILLET
OR PLUG
13A Section Through the Floor
13B Enlarged Detail of Timber Runner
SKIRTING
^
TIMBER BILL! JOINT
50
■P-V^ J ■> ■> s s^ s -rt\
~m
L ' nn max
f
Jt50
too
TIMBER FILLET
OR PLUG
13C Section through Floor
T
40
r
20
■ 5 ° ■
SIDE ELEVATION TOP PLAN
13D Enlarged Detail of Timber Billi Joint
All dimensions in millimetres.
Fig. 13 Special Floors
IS 3670 : 1989
11
IS 3670 : 1989
14A Square or 14B Splayed 14C Rebated and 14D Rebated
Butt Filleted
p. WIDTH OF
PLANK
LOOR JOIST
With screw visible With screw invisible
14E Tongued and Grooved
S. i
z3\
3^:
3EL.
£§1
14F Rebated Tongued 14G Splayed, Rebated, 14H Ploughed and
and Grooved Tongued and Grooved Tongued
Fig. 14 Different Types of Joints in Timber Flooring Boards
ANNEX A
(Clause 2.1)
LIST OF REFERRED INDIAN STANDARDS
IS No. Title
IS 401 : 1982 Code of practice for preservation
of timber ( third revision )
IS 707 : 1976 Glossary of terms applicable to
timber technology and utilization
( second revision )
IS 723 : 1972 Specification for steel countersunk
head wire nails (second
revision )
IS 833 : 1970 Code of practice for design of
structural timber in buildings
( second revision )
IS 1141 : 1973 Code of practice for seasoning of
timber (first revision )
IS No. Title
IS 1609 : 1976 Code of practice for laying damp-
proof treatment using bitumen
felts ( second revision )
IS 1905 : 1980 Code of practice for structural
saftey of buildings : Masonry
wells ( second revision )
IS 3629 : 1986 Specification for structural timber
in building (first revision )
IS 6313 Code of practice for anti termite
(Parti): 1981 measures in buildings: Part 1
Constructional measures (first
revision )
12
IS 3670 : 1989
ANNEX B
( Clause 5.1.1 )
SPECIES GF TIMBER, RECOMMENDED FOR TIMBER FLOORS
B-l SPECIES OF TIMBER
B-l.l The following species listed according to the percentage of indentation for hardness; taking teak
( tectona grandis) as 100, may be used for floor boards.
Botanical Name
Dipterocarpus indicus Bedd
Soymida febrifuga A Juss
( Pterocarpus dalbergiolides Roxb. )
Chloroxylon swietenia DC
Carallia brachiatta
Anogeissus latifolia Wall
Albizia odoratissima Benth
Pterocarpus marsupium Roxb
Terminalia tomer tosu Weghtel Am
Terminalia bialata Steudel
Tectona grandis Linn.f
Adina cordifolia Roxb H.K.F.
Lagerstroemia parviflora Roxb
Dysoxylum malabaricum Bedd
Terminalia paniculata Roth
Palagium ellipticum
Albizia lebbeck Benth
Dalbergia latifolia Roxb
Bridelia retusa Spreng
Dalbergia sissoo Roxb
Kingiodendron pinnatum ( syn. Hardwickia Pinnata )
Grevillea robust a A. cunn
Lagerstroemia speciosa Pers
Terminalia myriocarpa Heurck & Muell. Arg.
Hardwickia binata Roxb
Abies pindrow Royle
Cupressus torulosa Don
Machilus macrantha Mees
B-l .2 For detailing the species of timber of timber suitable for floor boards ( listed in order
hardness ), other important characteristics, namely, shock resisting ability, strength as a beam
of shape have also been taken into account.
No.
Trade Name
1
Gurjan
2
Rohini
3
Padauk
4
Satinwood
5
Maniawga
6
Axlewood
7
Kalasiris
8
Bijasal
9
Laurel
10
White chuglam
11
Teak
12
Haldu
13
Lendi
14
White cedar
15
Kindal
16
Pali
17
Kokko
18
Rosewood
19
Kassi
20
Sissoo
21
Piney
22
Silver oak
23
Jarul
24
Hollock
25
Anjan
26
Fir
27
Cypress
28
Machilus
Relative
Hardness
135
130
130
130
125
120
120
100
100
100
100
100
95
95
95
90
90
90
85
85
85
85
80
75
70
65
60
55
of strength in
and retention
ANNEX C
( Clause 5.1.1 )
SPECIES OF TIMBER RECOMMENDED FOR GIRDERS AND PROJECTING JOISTS
For girders, binders, and bridging joists,
following species may be used:
the
a) For spans of 12 m and greater, all the
species of Group 'Super' specified in
IS 3629 : 1986.
b) For spans greater than 6 m but less than 12 m,
all the species of Group 'Standard' specified
in IS 3629 : 1986, and
c) For spans up to and including 6 m, all the
species of Group 'Ordinary' specified in
IS 3629 : 1986.
13
IS 3670 : 1989
ANNEX D
( Clause 5.1.2 )
SPECIFICATION OF TIMBER FOR WOODEN FLOOR BOARD
D-l TIMBER FOR FLOOR BOARD
D-l.l The appearance of timber shall be a matter
for agreement between the purchaser and the vendor.
D-l .2 The abrasion (hardness) resistance shall be
sufficient to withstand constant wear and tear.
D-1.3 The species should preferably be of non-
refractory nature so that it is easily seasoned in open
air and sun with systematic stacking.
D-1.4 Thickness of floor boards should be from 25
to 40 mm.
D-l .5 Depending upon the availability and strength,
any of the species given in B-l may be used as floor
boards.
D-2 TIMBER FOR FLOOR JOISTS, BINDERS
AND GIRDERS
D-2. 1 The modulus of elasticity E, of the species
should not be less than 5 625 N/mrn 2 .
D-2.2 The extreme fibre stress ft, of the species
should not be less than 8'5 N/mm 2 .
D-2.3 The species shall be such as to be rapidly
seasoned and free from defects.
NOTE — Depending upon the availability and strength
desired, the species for floor joists, binders and girders
shall be selected from IS 3629 : 1986 and as specified in
Annex C.
ANNEX E
( Clause 11.2)
TYPES OF FLOOR SEALS (FOREIGN PRODUCTS)
E-l FLOOR SEALS
E-l.l The floor seals given in E-l. 1.1 to E-l. 1.9 may
generally be used.
E-l. 1.1 Oleoresinous
This type shall be made by cooking dry oils ( often
tung oil ) with a resin ( often a phenolic resin ).
This is easily applied, is soft and does not dry very
quickly.
This type is of high viscosity as well as of low
viscosity.
E-l. 1.2 Epoxy Ester
This type is harder wearing and more glossy.
E-l.1.3 Resin Solutions
This type consists of solutions of resins ( for example,
nitrocellulose, cresol resin ) in volatile solvents. It
dries rapidly.
E-l. 1.4 Urea Formaldehyde, Self Cure
This type has superior transparency and wear pro-
perties to oleoresinous seals. It is a better adhesive.
E-l.1.5 Urea Formaldehyde, Unmodified
These products have a hard-wearing finish of good
appearance. They take long time to harden. These
are water-sensitive and thus unsuitable near exterior
doors. They have good adhesive properties.
E-l. 1.6 Urea Formaldehyde, Modified, Organic
Solvent
These products are hard-wearing but have some
difficulty in refinishing. An acid hardener is mixed
with the finish before use and it has a limited pot
life.
E-l. 1.7 Epoxy Resin
The hardener is mixed in before use. Excellent
results are obtained but the drying time is rather
long.
E-l.1.8 Polyurethane
These products have excellent wear and stain
resistance with slow drying.
E-l.1.9 Resin Emulsions
These products may be used as a regular maintenance
treatment to prolong the life of the seal.
14
Standard Mark
The use of the Standard Mark is governed by the provisions of the Bureau of Indian
Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on
products covered by an Indian Standard conveys the assurance that they have been produced
to comply with the requirements of that standard under a well defined system of inspection,
testing and quality control which is devised and supervised by BIS and operated by the
producer. Standard marked products are also continuously checked by BIS for conformity
to that standard as a further safeguard. Details of conditions under which a licence for the
use of the Standard Mark may be granted to manufacturers or producers may be obtained
from the Bureau of Indian Standards.
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote
harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.
Copyright
BIS has the copyright of all its publications. No part of these publications may be reproduced in
any form without the prior permission in writing of BIS. This does not preclude the free use, in the
course of implementing the standard, of necessary details, such as symbols and sizes, type or grade
designations. Enquiries relating to copyright be addressed to the Director Publications), BIS.
Revision of Indian Standards
Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are
issued from time to time. Users of Indian Standards should ascertain that they are in possession of
the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the
following reference:
Doc : No. BDC 13 ( 4548 )
Amendments Issued Since Publication
Amend No.
Date of Issue
Text Affected
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